California Drought Killed 12 Million Forest Trees Since Last Year | KPBS
An estimated 12 million trees across California’s forestlands have died over the past year because of extreme drought conditions, according to an aerial survey conducted April 8-17 by the U.S. Forest Service.
In San Diego County, 82,528 trees, mostly Jeffrey pines across Mt. Laguna, have succumbed to a lack of rainfall, with many more struggling to survive, said Jeffrey Moore, interim aerial survey program manager for the U.S. Forest Service.
Tree Mortality In Southern California Forests
The extent and severity of tree mortality, which occurred after the 2014 aerial surveys in Southern California Forests.
Southern Sierra Tree Mortality
Recently dead or injured trees were mapped visually by a surveyor using a digital aerial sketch-mapping system flying in a light fixed-wing aircraft approximately 1,000 feet above ground level.
There is “very heavy mortality, a lot of discoloration in the pine trees that probably will expire sometime during this growing season, as well as oak trees that are suffering,” Moore said.
Moore was part of a team that surveyed the trees visually, using a digital mapping system while flying in a fixed-wing aircraft 1,000 feet above ground.
A tree’s survival often depends on its proximity to other trees, he said.
Read more: http://www.kpbs.org/news/2015/may/04/california-drought-kills-12-million-forest-trees-l/